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A nanometer zero-valent iron-carbon material and its preparation method and application

A nano-zero-valent iron and carbon material technology, applied in the field of nano-materials, can solve the problems of easy agglomeration and passivation of materials, complex preparation process, uneven particles, etc., and achieve the effect of promoting electron transfer, simple preparation and uniform dispersion

Active Publication Date: 2021-09-21
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, using NaBH 4 Reduction method and hydrogen reduction method can produce higher activity nZVI, but NaBH 4 The price is high, the preparation process is complicated, and flammable and explosive H 2 Potentially dangerous, which hinders the application of these methods in the large-scale production of nano-scale zero-valent iron-carbon materials
The use of high-energy ball milling iron powder method has the problem of uneven particles. In contrast, the reaction of carbothermal reduction method is an endothermic process, which is easy to scale and continuous production, but the problem of easy agglomeration and passivation of materials also limits its practicality. application

Method used

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  • A nanometer zero-valent iron-carbon material and its preparation method and application
  • A nanometer zero-valent iron-carbon material and its preparation method and application
  • A nanometer zero-valent iron-carbon material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0049] A nanometer zero-valent iron-carbon material, the preparation method comprising the following steps:

[0050] (1) Ferrous acetate and ethylenediaminetetraacetic acid are placed in a ball mill at a mass ratio of 3:1, zirconia grinding balls with a diameter of 7 mm and 5 mm are added, and ground at a rotating speed of 300 rpm for 3 hours to obtain a mixture;

[0051] (2) Place the mixture of step (1) in a tube furnace, raise the temperature to 800° C. at a heating rate of 5° C. / min under a nitrogen gas atmosphere, and calcinate for 3 hours;

[0052] (3) obtain after cooling the material obtained in step (2).

Embodiment 2

[0054] A nanometer zero-valent iron-carbon material, the preparation method comprising the following steps:

[0055] (1) ferrous sulfate and aminotriacetic acid are placed in a ball mill in a mass ratio of 4:1, adding diameters of 10mm and 5mm stainless steel grinding balls, and grinding for 4 hours at a rotating speed of 350rpm to obtain a mixture;

[0056] (2) Place the mixture of step (1) in a tube furnace, raise the temperature to 900° C. at a heating rate of 8° C. / min under a nitrogen gas atmosphere, and calcinate for 5 hours;

[0057] (3) obtain after cooling the material obtained in step (2).

Embodiment 3

[0059] A nanometer zero-valent iron-carbon material, the preparation method comprising the following steps:

[0060] (1) Put ferrous nitrate and diethylenetriaminepentaacetic acid in a ball mill at a mass ratio of 2:1, add zirconia grinding balls with a diameter of 5 mm and 2 mm, and grind for 4 hours at a rotating speed of 350 rpm to obtain a mixture ;

[0061] (2) Place the mixture of step (1) in a tube furnace, and raise the temperature to 900° C. at a heating rate of 10° C. / min under a nitrogen gas atmosphere, and calcinate for 2 hours;

[0062] (3) obtain after cooling the material obtained in step (2).

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Abstract

The invention relates to the field of nanometer materials, in particular to a nanometer zero-valent iron-carbon material and its preparation method and application. The material includes a carbon layer and ultra-fine nano-zero-valent iron uniformly distributed in the carbon layer, wherein the iron content is as high as 92-97%, and the particle size of the nano-zero-valent iron is between 3-8nm. Further, the nano-zero The element composition of the valent iron-carbon material also includes at least one of oxygen and nitrogen, wherein there is a coordination bond between the iron and nitrogen, and the nanometer zero-valent iron-carbon material is a porous material with a specific surface area of ​​120-140m 2 / g, the pore volume is 0.3‑0.4cm 3 / g, the pore size is 2-3nm. The nanometer zero-valent iron-carbon material provided by the invention has better activity of degrading organic pollutants, and can be used in the treatment of sewage polluted by organic matter.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a nanometer zero-valent iron-carbon material and its preparation method and application. Background technique [0002] Commonly used water treatment methods include adsorption, coagulation, membrane separation, microbial degradation, and iron-carbon micro-electrolysis. Among them, the basic principle of the iron-carbon micro-electrolysis method is: in polluted water, iron-carbon materials form countless tiny primary batteries due to the potential difference between iron and carbon, in which low-potential iron is the anode and high-potential carbon is the cathode. The electrochemical reaction occurs to degrade the pollutants. At the same time, the material utilizes the dissolved oxygen in the solution to generate H in situ 2 o 2 , H 2 o 2 Decomposition produces highly active hydroxyl radicals, further improving the degradation efficiency of organic pollutants. The iron-car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/467C02F101/30
CPCC02F1/4672C02F2101/30
Inventor 赵晓丽吕宏洲吴丰昌牛红云
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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